Cov nyhuv ntawm cellulose ether ntawm putty hmoov

1. cellulose ether - cellulose ether ua ntej

Cellulose ether yog polysaccharide ntau tshaj plaws hauv ntiaj teb niaj hnub no.Lub ntsiab qhov chaw ntawm ntuj cellulose yog paj rwb, ntoo, dej nroj tsuag, nyom thiab lwm yam.Paj rwb muaj 92-95% cellulose;Flax muaj txog 80% cellulose;Ntoo muaj txog 50% cellulose.

2, cellulose ether qauv

Cellulose ether yog ib tug complex polysaccharide uas muaj ntau txhiab tus qabzib units nyob rau hauv lub molecule, tshuaj formula yog (C6H10O5) N. Cov D-qabzib pawg yog khi los ntawm β – 1,4 glucoside bonds.

Cov teeb meem tshwm sim thiab cov laj thawj tseem ceeb ntawm dej tsis kam putty rau sab hauv phab ntsa

Cov txheej txheem daws teeb meem

Neutral putty:

Depowder: cov khoom siv cementitious tsis txaus, cellulose ether dej tuav tsis txaus, cov ntsiab lus calcium uas hnyav calcium tsawg.

Kev tsim kho kev ua haujlwm: txhim kho los ntawm bentonite thiab starch ether.

Npuas nruas;Thiab phab ntsa adhesion tshwm sim los ntawm kev tsis txaus.

Txheej: interface ua.

Lub zog: kuj tuaj yeem hloov kho los ntawm kev muab cov calcium hmoov.

Txiv qaub calcium putty:

Cov teeb meem yog npliag nruas, depowder yellowing, kev tsim kho tsis zoo, depowder, stratification, tawg, tom qab thickening;

Depowder: cov khoom siv cementitious tsis txaus, tsis txaus cellulose dej tuav lossis tsis txaus ntxiv, txiv qaub calcium tsis huv.

Kev tsim kho tsis zoo: bentonite thiab starch ether los txhim kho.

Npuas nruas;Thiab tsis txaus cov phab ntsa adhesion tshwm sim los ntawm qhov tsim nyog ntxiv ntawm latex hmoov.

Txheej: interface ua.

Yellowing: xaiv tsis raug ntawm cellulose ether.

Cracking: puag cracking los yog nyuaj heev tawg lub zog, txheej tuab heev.

Tom qab thickening: hnyav calcium dej nqus tus nqi sib txawv, nws raug nquahu kom xaiv xoom dej nqus los yog cov hmoov calcium hnyav heev;Grey calcium muaj undigested GaO.

Cement-based putty:

Teeb meem ntawm lub nruas khoob, kev tsim kho tsis zoo, depowder, delamination, tawg, dej tsis txaus, tsis muaj coagulation;

Depowder: cov khoom siv cementitious tsis txaus, tsis txaus cellulose ether dej tuav lossis tsis txaus ntxiv.

Kev tsim kho tsis zoo: bentonite thiab starch ether los txhim kho.

Npuas nruas: thiab phab ntsa adhesion tshwm sim los ntawm tsis txaus, tsim nyog ntxiv ntawm latex hmoov.

Txheej: interface ua.

Yellowing: xaiv cellulose tsis raug.

Kev tiv thaiv dej tsis txaus: tsis txaus latex hmoov thiab cov ntaub ntawv cementitious tsis txaus.

Cracking: puag cracking los yog muaj zog heev tawg, txheej yog tuab heev, nrog putty sau lub qhov.

False coagulation: sodium gluconate tuaj yeem muab ntxiv kom ntev lub sijhawm ua haujlwm.